Key Takeaways
1. Noctua is set to showcase a thermosiphon AIO CPU cooler prototype at Computex 2025, featuring large V-shaped cooling channels for improved circulation.
2. The thermosiphon cooler has undergone significant design changes since its initial reveal at Computex 2024, including a revamped CPU block with larger coolant capacity.
3. This passive cooling system uses the heat from the CPU to circulate coolant without a pump, similar to a heat pipe or vapor chamber.
4. Noctua aims for optimal cooling and performance while minimizing noise with the thermosiphon, aligning with their brand focus on silent operation.
5. The cooler’s radiator will likely include Noctua’s renowned quiet fans, enhancing overall cooling efficiency while maintaining low noise levels.
Noctua has previously presented prototypes of a thermosiphon AIO CPU cooler, suggesting that it might soon go into production. Now, it looks like the company is set to reveal the cooler prototype to a broader audience at Computex in Taipei, Taiwan.
Upcoming Showcase at Computex
Recent updates from Noctua on X indicate that the thermosiphon cooler, or at least a variant of it, will be displayed at Computex 2025. The teaser included a sneak peek at the hardware, showcasing large cooling channels that are milled into the CPU block. These channels have a V shape, which implies that the orientation of the CPU block and possibly the entire cooling system will be crucial for effective cooling and circulation.
Design Changes Noticed
The thermosiphon made its first appearance at Computex 2024, but it seems to have undergone major design modifications since then, judging by the images in this PC Gamer article. The new version that Noctua teased in the X post features a revamped CPU block, complete with the V-shaped channels and possibly a larger capacity for coolant within the CPU block itself. PC Gamer also notes that it appears the thermosiphon may go into production in 2026.
How It Works
A thermosiphon is a passive cooling system that relies on the heat produced by the CPU to circulate the liquid throughout the loop, as explained by Arrow Electronics. Its basic function is akin to that of a heat pipe or vapor chamber: The coolant heats up, rises to the highest point in the cooling loop, where it condenses, cools down, and returns to circulation. The idea is to use a liquid with a lower boiling point than the CPU’s target temperature, allowing for coolant circulation without needing a pump.
For Noctua, the concept of a thermosiphon seems very logical, as much of the brand’s marketing and products focus on achieving optimal cooling and performance while minimizing noise. This appears to be the aim with the thermosiphon as well, since the company noted in a response to a comment that “If it’s loud, Noctua probably wouldn’t be working on it.”
Silent Operation Expected
The radiator side of the thermosiphon will likely still include fans, but Noctua is renowned for its nearly silent fans, like the Noctua NF-A12x25 (currently priced at $34.95 on Amazon).
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